hw/s390x/ipl.c

   1 /*
   2  * bootloader support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <borntraeger@de.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  10  * option) any later version.  See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "sysemu/sysemu.h"
  15 #include "cpu.h"
  16 #include "elf.h"
  17 #include "hw/loader.h"
  18 #include "hw/sysbus.h"
  19 #include "hw/s390x/virtio-ccw.h"
  20 #include "hw/s390x/css.h"
  21 #include "ipl.h"
  22
  23 #define KERN_IMAGE_START                0x010000UL
  24 #define KERN_PARM_AREA                  0x010480UL
  25 #define INITRD_START                    0x800000UL
  26 #define INITRD_PARM_START               0x010408UL
  27 #define INITRD_PARM_SIZE                0x010410UL
  28 #define PARMFILE_START                  0x001000UL
  29 #define ZIPL_IMAGE_START                0x009000UL
  30 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
  31
  32 #define TYPE_S390_IPL "s390-ipl"
  33 #define S390_IPL(obj) \
  34     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  35 #if 0
  36 #define S390_IPL_CLASS(klass) \
  37     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  38 #define S390_IPL_GET_CLASS(obj) \
  39     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  40 #endif
  41
  42 typedef struct S390IPLClass {
  43     /*< private >*/
  44     SysBusDeviceClass parent_class;
  45     /*< public >*/
  46
  47     void (*parent_reset) (SysBusDevice *dev);
  48 } S390IPLClass;
  49
  50 typedef struct S390IPLState {
  51     /*< private >*/
  52     SysBusDevice parent_obj;
  53     uint64_t start_addr;
  54     uint64_t bios_start_addr;
  55     bool enforce_bios;
  56     IplParameterBlock iplb;
  57     bool iplb_valid;
  58     bool reipl_requested;
  59
  60     /*< public >*/
  61     char *kernel;
  62     char *initrd;
  63     char *cmdline;
  64     char *firmware;
  65     uint8_t cssid;
  66     uint8_t ssid;
  67     uint16_t devno;
  68 } S390IPLState;
  69
  70 static const VMStateDescription vmstate_iplb = {
  71     .name = "ipl/iplb",
  72     .version_id = 0,
  73     .minimum_version_id = 0,
  74     .fields = (VMStateField[]) {
  75         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  76         VMSTATE_UINT16(devno, IplParameterBlock),
  77         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  78         VMSTATE_END_OF_LIST()
  79     }
  80 };
  81
  82 static const VMStateDescription vmstate_ipl = {
  83     .name = "ipl",
  84     .version_id = 0,
  85     .minimum_version_id = 0,
  86     .fields = (VMStateField[]) {
  87         VMSTATE_UINT64(start_addr, S390IPLState),
  88         VMSTATE_UINT64(bios_start_addr, S390IPLState),
  89         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  90         VMSTATE_BOOL(iplb_valid, S390IPLState),
  91         VMSTATE_UINT8(cssid, S390IPLState),
  92         VMSTATE_UINT8(ssid, S390IPLState),
  93         VMSTATE_UINT16(devno, S390IPLState),
  94         VMSTATE_END_OF_LIST()
  95      }
  96 };
  97
  98 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
  99 {
 100     uint64_t dstaddr = *(uint64_t *) opaque;
 101     /*
 102      * Assuming that our s390-ccw.img was linked for starting at address 0,
 103      * we can simply add the destination address for the final location
 104      */
 105     return srcaddr + dstaddr;
 106 }
 107
 108 static int s390_ipl_init(SysBusDevice *dev)
 109 {
 110     S390IPLState *ipl = S390_IPL(dev);
 111     uint64_t pentry = KERN_IMAGE_START;
 112     int kernel_size;
 113
 114     int bios_size;
 115     char *bios_filename;
 116
 117     /*
 118      * Always load the bios if it was enforced,
 119      * even if an external kernel has been defined.
 120      */
 121     if (!ipl->kernel || ipl->enforce_bios) {
 122         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
 123
 124         if (bios_name == NULL) {
 125             bios_name = ipl->firmware;
 126         }
 127
 128         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 129         if (bios_filename == NULL) {
 130             hw_error("could not find stage1 bootloader\n");
 131         }
 132
 133         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 134                              &ipl->bios_start_addr, NULL, NULL, 1,
 135                              ELF_MACHINE, 0);
 136         if (bios_size > 0) {
 137             /* Adjust ELF start address to final location */
 138             ipl->bios_start_addr += fwbase;
 139         } else {
 140             /* Try to load non-ELF file (e.g. s390-zipl.rom) */
 141             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 142                                             4096);
 143             ipl->bios_start_addr = ZIPL_IMAGE_START;
 144         }
 145         g_free(bios_filename);
 146
 147         if (bios_size == -1) {
 148             hw_error("could not load bootloader '%s'\n", bios_name);
 149         }
 150
 151         /* default boot target is the bios */
 152         ipl->start_addr = ipl->bios_start_addr;
 153     }
 154
 155     if (ipl->kernel) {
 156         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 157                                NULL, 1, ELF_MACHINE, 0);
 158         if (kernel_size < 0) {
 159             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 160         }
 161         if (kernel_size < 0) {
 162             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 163             return -1;
 164         }
 165         /*
 166          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 167          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 168          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 169          * loader) and it won't work. For this case we force it to 0x10000, too.
 170          */
 171         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 172             ipl->start_addr = KERN_IMAGE_START;
 173             /* Overwrite parameters in the kernel image, which are "rom" */
 174             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 175         } else {
 176             ipl->start_addr = pentry;
 177         }
 178
 179         if (ipl->initrd) {
 180             ram_addr_t initrd_offset;
 181             int initrd_size;
 182
 183             initrd_offset = INITRD_START;
 184             while (kernel_size + 0x100000 > initrd_offset) {
 185                 initrd_offset += 0x100000;
 186             }
 187             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 188                                               ram_size - initrd_offset);
 189             if (initrd_size == -1) {
 190                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 191                         ipl->initrd);
 192                 exit(1);
 193             }
 194
 195             /*
 196              * we have to overwrite values in the kernel image,
 197              * which are "rom"
 198              */
 199             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 200             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 201         }
 202     }
 203     return 0;
 204 }
 205
 206 static Property s390_ipl_properties[] = {
 207     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 208     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 209     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 210     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 211     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 212     DEFINE_PROP_END_OF_LIST(),
 213 };
 214
 215 /*
 216  * In addition to updating the iplstate, this function returns:
 217  * - 0 if system was ipled with external kernel
 218  * - -1 if no valid boot device was found
 219  * - ccw id of the boot device otherwise
 220  */
 221 static uint32_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl)
 222 {
 223     DeviceState *dev_st;
 224
 225     if (ipl->iplb_valid) {
 226         ipl->cssid = 0;
 227         ipl->ssid = 0;
 228         ipl->devno = ipl->iplb.devno;
 229         goto out;
 230     }
 231
 232     if (ipl->kernel) {
 233         return 0;
 234     }
 235
 236     dev_st = get_boot_device(0);
 237     if (dev_st) {
 238         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 239             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 240                 TYPE_VIRTIO_CCW_DEVICE);
 241         if (ccw_dev) {
 242             ipl->cssid = ccw_dev->sch->cssid;
 243             ipl->ssid = ccw_dev->sch->ssid;
 244             ipl->devno = ccw_dev->sch->devno;
 245             goto out;
 246         }
 247     }
 248
 249     return -1;
 250 out:
 251     return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno;
 252 }
 253
 254 int s390_ipl_update_diag308(IplParameterBlock *iplb)
 255 {
 256     S390IPLState *ipl;
 257
 258     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 259     if (ipl) {
 260         ipl->iplb = *iplb;
 261         ipl->iplb_valid = true;
 262         return 0;
 263     }
 264     return -1;
 265 }
 266
 267 IplParameterBlock *s390_ipl_get_iplb(void)
 268 {
 269     S390IPLState *ipl;
 270
 271     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 272     if (!ipl || !ipl->iplb_valid) {
 273         return NULL;
 274     }
 275     return &ipl->iplb;
 276 }
 277
 278 void s390_reipl_request(void)
 279 {
 280     S390IPLState *ipl;
 281
 282     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 283     ipl->reipl_requested = true;
 284     qemu_system_reset_request();
 285 }
 286
 287 static void s390_ipl_reset(DeviceState *dev)
 288 {
 289     S390IPLState *ipl = S390_IPL(dev);
 290     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 291     CPUS390XState *env = &cpu->env;
 292
 293     env->psw.addr = ipl->start_addr;
 294     env->psw.mask = IPL_PSW_MASK;
 295
 296     if (!ipl->reipl_requested) {
 297         ipl->iplb_valid = false;
 298     }
 299     ipl->reipl_requested = false;
 300
 301     if (!ipl->kernel || ipl->iplb_valid) {
 302         env->psw.addr = ipl->bios_start_addr;
 303         env->regs[7] = s390_update_iplstate(env, ipl);
 304     }
 305
 306     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 307 }
 308
 309 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 310 {
 311     DeviceClass *dc = DEVICE_CLASS(klass);
 312     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 313
 314     k->init = s390_ipl_init;
 315     dc->props = s390_ipl_properties;
 316     dc->reset = s390_ipl_reset;
 317     dc->vmsd = &vmstate_ipl;
 318     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 319 }
 320
 321 static const TypeInfo s390_ipl_info = {
 322     .class_init = s390_ipl_class_init,
 323     .parent = TYPE_SYS_BUS_DEVICE,
 324     .name  = "s390-ipl",
 325     .instance_size  = sizeof(S390IPLState),
 326 };
 327
 328 static void s390_ipl_register_types(void)
 329 {
 330     type_register_static(&s390_ipl_info);
 331 }
 332
 333 type_init(s390_ipl_register_types)